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Just a brief research into Mega, found from their own site and other internet searches.
Mega current marketing tagline; "As the proud no. 2 in construction, we forge our own path and challenge expectations..." At least they are not delusional to their market status.
Mega/Mega Construx (Wonder Builders & Probuilders lines) is currently marketing on there own site: Pokémon, Hot Wheels, Barbie, Halo, Motu, and Black Series.
Some history:
1967-Ritvik Holdings is created, a Canadian toy distributor
1984- Ritvik introduces the Mega Brands toy line to Canada and the U.S
1991- Launched “micro” brick (standard sized construction bricks) Lego vs Mega lawsuit fun for years. Note: Mega Brands has won 14 cases launched by competitor Lego regarding its Mega Bloks.
2008-now: Halo (note: product usually appears on shelf about 1 year after... not a bad turnover time)
2012-now: Barbie and Hot Wheels
2013-now: (RIP) COD (8+ years)
2014: Mattel bought Mega
2017-now: Pokémon (originally under the pro builders line)
A not exhaustive list of themes and licenses once held (from wiki & some are missing)
Thomas and Friends-Teletubbies-Hot Wheels-Barbie-Monster High-American Girl-Masters of the Universe-Power Rangers-Halo-Call of Duty-Destiny-In the Night Garden-Bob the Builder-Blaze and the Monster Machines-Shimmer and Shine-SpongeBob SquarePants-Pokémon-Game of Thrones-Teenage Mutant Ninja Turtles-Marvel-Pirates of the Caribbean-Cars-Sesame Street-Star Trek-Skylanders-Borderlands-Despicable Me-Dinotrux-Spider-Man 3-The Amazing Spider-Man-Marvel Cinematic Universe-Need for Speed-Assassin's Creed-PJ Masks-Ni Hao, Kai-Lan-Go, Diego, Go!-Dora the Explorer-The Backyardigans-Yo Gabba Gabba!-Wonder Pets!-Alien (franchise)-Legends: King Arthur-Dragons-World of Warcraft-Neo Shift-
Mega is currently not marketing, but we have had substantiated rumors of the Witcher license. They also still have the Alien license, but aren't utilizing it. Maybe other licenses still sit unused.