<ul>
      {% for 15 in episode.name %}
          <li><a href="{{ STATIC_URL }}video/S{{numberSeason}}01.webm">{{episode.name}}</a></li>
      {% endfor %}
</ul>

{{episode.name.1}}
{{episode.name.2}}
{{episode.name.3}}
...
{{episode.name.15}}

<ul>
      {% for item in episode.name %}
          <li><a href="{{ STATIC_URL }}video/S{{numberSeason}}01.webm">{{item}}</a></li>
      {% endfor %}
</ul>

      <h4>{{ description.header.1}}</h4>

      <h4>{{ description.header.{{ myVariavble }} }}</h4>

      <h4>{{ description.header.myVariavble}}</h4>

@register.filter(name='get_elem_by_index')
def get_elem_by_index(value, index):
    return value[index]

<h4>{{ description.header|get_elem_by_index:myVariavble}}</h4>

from django import template
register = template.Library()
@register.filter(name='get_elem_by_index')
def get_elem_by_index(value, index):
    return value[index]