The spring season is officially here (you can see the full schedule at this link) and this week gets it kicked off with two premieres. On Tuesday, Hulu’s new sci fi / horror anthology Dimension 404 has its debut and it will release a new episode each week throughout its six-episode first season. Also on that night, The CW’s iZombie returns for its third season. And Tuesday is busy this week with Agents of SHIELD returning from hiatus to wind down its fourth season and Legends of Tomorrow having its third season finale. Then on Thursday, USA’s fan-favorite series Colony has its second season finale (join the movement to convince that network to give it a third year renewal). Note that most of The CW’s shows are going on their second hiatus starting this week or next and will be returning later in April or the beginning of May to wrap up their current seasons. But there are plenty more shows that will be joining the schedule this month to keep sci fi and fantasy fans busy in front of the tube, See the full listings at our partner SciFiTVSite.com.