Sheldon's Shirts from Season 04 of The Big Bang Theory

Season 04, Episode 01: "The Robotic Manipulation"

'Tripple Threat' Shirt	'Opti Blocks' Shirt

Season 04, Episode 02: "The Cruciferous Vegetable Amplification"

'Man-Bot' Shirt	'Retro Flash' Shirt	Green Lantern Shirt	'TV Test Pattern' Shirt

Season 04, Episode 03: "The Zazzy Substitution"

'Nanotubes' Shirt	'Batman - Riddler Question Mark' Shirt	'Superman Athletic/Distressed' Shirt	'Penrose Triangles' Shirt
'Robot Evolution' Shirt	Vertical Test Bars Shirt

Season 04: Episode 04: "The Hot Troll Deviation"

'Atmospheric CO2' Shirt	'Geometry' Shirt	BDG Dark Striped Shirt	'Space Invaders' Shirt
'Green Lantern Flying X' Shirt

Season 04, Episode 05: "The Desperation Emanation"

'Green Arrow Shield Bullseye' Shirt	'Flash Lightning' Shirt	Spiders & Bugs Shirt

Season 04, Episode 06: "The Irish Pub Formulation"

'Hawkman' Shirt	Orange 'Aquaman' Shirt	BDG Angled/Striped Shirt

Season 04, Episode 07: "The Apology Insufficiency"

'Antique Radios' Shirt	'Man-Bot' Shirt	'Flash Crimson Comet' Shirt	'Batman Gradient Logo' Shirt
'Life Cube' Shirt

Season 04, Episode 08: "The 21-Second Excitation"

'TV Test Pattern' Shirt	'Shoot 'Em Up' Shirt

Season 04, Episode 09: "The Boyfriend Complexity"

'Rainbow Bolts' Shirt	BDG Toxic Striped Shirt

Season 04, Episode 10: "The Alien Parasite Hypothesis"

'Robot Evolution' Shirt	BDG Gray and Aqua Striped Shirt

Season 04, Episode 11: "The Justice League Recombination"

'Penrose Triangles' Shirt	Flash Costume	X-Ray Skulls Shirt

Season 04, Episode 12: "The Bus Pants Utilization"

'Nanotubes' Shirt	'Color Bars' Shirt

Season 04, Episode 13: "The Love Car Displacement"

'Flash Logo' Shirt	Unknown Purple/Stripe Angles Shirt	Plaid Blazer	'Goodnight' Shirt

Season 04, Episode 14: "The Thespian Catalyst"

Plaid Blazer	'73' Shirt	'Retro Flash' Shirt	BDG Dark Striped Shirt

Season 04, Episode 15: "The Benefactor Factor"

BDG Aqua with Yellow Stripes Shirt	Green Lantern Shirt	'TV Test Pattern' Shirt	'Penrose Triangles' Shirt

Season 04, Episode 16: "The Cohabitation Formulation"

BDG Blue with Dots Shirt	Orange 'Aquaman' Shirt	'Green Lantern' Athletic Shirt	'Are You Grid-Equipped?' Shirt

Season 04, Episode 17: "The Toast Derivation"

'Nanotubes' Shirt	Recycled Tree Shirt

Season 04, Episode 18: "The Prestidigitation Approximation"

Purple and Gray Striped Shirt	'Penrose Triangles' Shirt	Yellow & Gray Striped Shirt	'Astrosmash' Shirt

Season 04, Episode 19: "The Zarnecki Incursion"

'Man-Bot' Shirt	'Robot Evolution' Shirt

Season 04, Episode 20: "The Herb Garden Germination"

'Are You Grid-Equipped?' Shirt	Toxic Striped Shirt	'Green Arrow Shield Bullseye' Shirt	BDG Toxic Striped Shirt

Season 04, Episode 21: "The Agreement Dissection"

'The Flash' Athletic Shirt

Season 04, Episode 22: "The Wildebeest Implementation"

'Flash Lightning' Shirt	'Nanotubes' Shirt

Season 04, Episode 23: "The Engagement Reaction"

'Geometry' Shirt	'Distressed Superman Logo' Shirt

Season 04, Episode 24: "The Roommate Transmogrification"

'73' Shirt	Green Lantern Shirt