Valentina Vostock to make her self known in the fourth episode of Legends of Tomorrow entitled 'White Knights' while Arrow's Stephen Amell is confirmed to make a cross over in one of the episodes of the DC superhero series. .

The big DC heroes' line-up finally debuted January and characters were introduced one by one. In coming episode called White Knights, the DC superheroes follow the trail of Vandal Savage (Casper Crump) which leads to Soviet Union. According to IMDB, Vandal Savage is to kidnap another scientist and the team must figure out who will be Savage's next victim.

The team crosses path with Valentina Vostock, a character to be played by Stephanie Cornerliussen, and attempts to get information on Savage. Ray Palmer (Brandon Routh) is assigned to get closer to Valentina but ultimately failed. Snart (Wentworth Miller) tries his luck and saves the mission after he deals with his past and self transformation.

The time travel series in search for the immortal Savage will land in Gotham City in its 1980s which will begin in the episode four of Legends of Tomorrow, the Forbes reported. It is also teased a potential Gotham and Legends of Tomorrow crossover but it will be difficult due to the fact the two shows are under rival networks.

Last year, news on Legends of Tomorrow and Arrow crossover spread in the internet which get DC fans excited. Movie Web reported that the crossover is finally happening and it is sooner than expected.

An older Oliver Queen, portrayed by Stephen Amell, is set to be seen in the 25th Februrary episode of the show. Oliver will be seen appearing in 2046 timeline together with son Connor Hawke. Arrow villains Damien Darhk (Neal McDonough) and Ra's al Ghul (Matthew Nable) are also to show up in one of the episodes of Legends of Tomorrow.

Legends of Tomorrow Episode 4 White Knights airs every Thursday on The CW.