Here are the relevant images from this episode of oHOTmu or NOT?
Like the cover of Legion of Super-Heroes vol.7 #17 and the weird alien mentioned on the show.
The death of Sun Boy in the same issue:
Legionnaires #7 - Sun Boy falls in love with a mermaid.
Legion of Super-Heroes vol.4 #35, and bloody fireworks:
Legion of Super-Heroes vol.2 #286 and Queen Projectra's castle:
And Captain America #316, a substantial Armadillo appearance.
Credits:
"Jingle Bells" (Theme for oHOTmu or NOT Xmas minisode) by Swing Shift.
Bonus clips from: "The Avengers Sing Christmas Carols" by James Covenant, starring Robert Downey Jr., Jeff Bridges, Samuel Jackson, Chris Evans, Mark Ruffalo, Djimon Hounsou, Tom Hiddleston, Anthony Hopkins, Gary Shandling, Jeremy Renner, Gwyneth Paltrow, and Scarlett Johansson; "Achievement Unlocked" by xBox.