30 sources
Adventure Comics (vol. 1) #457 (May 1978): "The Symbiont Syndrome"The Avengers (vol. 1) #171 (May 1978): "...Where Angels Fear to Tread"Black Lightning (vol. 1) #9 (May 1978): "Fear and Loathing in Garfield High"Black Panther (vol. 1) #9 (May 1978): "Black Musketeers"
Captain AmericaCaptain Marvel (vol. 1) #56 (May 1978): "Survival Quest!"Daredevil (vol. 1) #152 (May 1978): "Prisoner!"The Defenders (vol. 1) #59 (May 1978): "Xenogenesis Day of the Demons, Part 2: Tyranny and Mutation"Devil Dinosaur #2 (May 1978): "Devil's War!"Fantastic Four (vol. 1) #194 (May 1978): "Vengeance is Mine!"Firestorm (vol. 1) #3 (May 1978): "Kiss Not the Lips of Killer Frost!"Green Lantern (vol. 2) #104 (May 1978): "Proof of the Peril!"The Human Fly #9 (May 1978): "...And Daredevil Makes Three!"The Invaders (vol. 1) #28 (May 1978): "Calling the Kid Commandos"Justice League of America (vol. 1) #154 (May 1978): "I'll Kill You in Your Dreams!"Machine Man (vol. 1) #2 (May 1978): "House of Nightmares"Marvel Team-Up (vol. 1) #69 (May 1978): "Night of the Living God!"Marvel Two-in-One (vol. 1) #39 (May 1978): "The Vision Gambit"Ms. Marvel (vol. 1) #17 (May 1978): "Shadow of the Gun!"Nova (vol. 1) #19 (May 1978): "Blackout Means Business, and His Business Is Murder!"Peter Parker, The Spectacular Spider-Man #18 (May 1978): "My Friend, My Foe!"Spider-Woman (vol. 1) #2 (May 1978): "A Sword in Hand!"StarlordThor (vol. 1) #271 (May 1978): "...Like a Diamond in the Sky!"The Tomb of Dracula (vol. 1) #64 (May 1978): "Life After Undeath"The Tomorrow People - Season 6, Episode 1 (15 May 1978): "The Lost Gods: Flight of Fancy"